LESS

Do you work hard with CSS and are tired of copying your items over and over again. Are you tired of the fact that everything is always ending in an inseparable file that is unobtrusive, then LESS is a good option for you as CSS develops, with LESS you get the opportunity to work more object oriented when you code your CSS files.

LESS is a good place to start but when you've been good at LESS, I can recommend you to jump and learn SASS as in my optics is a more advanced version of LESS, for me, LESS was a great place to start to Learn object oriented programming in CSS and to understand the concept, but today I only use SASS as I compile with Gulp.